Polytelluride square planar chain induced anharmonicity results in ultralow thermal conductivity and high thermoelectric efficiency in Al2Te5 monolayers

A polytelluride [Te 3 ] 2− chain and a [Al 2 Te 2 ] 2+ framework lead to significant anharmonic thermal conductivity in Al 2 Te 5 monolayers. The Te chain affects electronic properties, resulting in a high valley degeneracy and thus zT value of 1.5 at 600 K.